CN210004388U - kinds of low-nitrogen burner - Google Patents
kinds of low-nitrogen burner Download PDFInfo
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- CN210004388U CN210004388U CN201920447790.6U CN201920447790U CN210004388U CN 210004388 U CN210004388 U CN 210004388U CN 201920447790 U CN201920447790 U CN 201920447790U CN 210004388 U CN210004388 U CN 210004388U
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Abstract
The utility model discloses an kind of low-nitrogen burners, including the casing, the casing is formed by fuel section and burning section coaxial coupling, is connected with the fuel gas takeover on the fuel section outer wall perpendicularly, is connected with combustion air takeover on the burning section outer wall perpendicularly, and the burning section still includes the fuel gas with fuel section intercommunicationThe utility model discloses a structure of fuel classification and flue gas inner loop, combustion-supporting air and level fuel spout spun air vertical impact, are lighted by the pilot burner, are at the combustor exit, and the secondary fuel blowout, joining the burning, high velocity air stream or flame form local negative pressure, form low temperature rich burning area to reduce NO and reduce NO's level fuel gas branch pipeline, level fuel gas branch pipeline and fuel gas channel intercommunication, set up level fuel spout on the level fuel branch pipeline, the burning section inboard still is connected with secondary fuel gas annulus channel and secondary fuel gas branch pipeline, and secondary fuel gas annulus end sets up a plurality of secondary fuel spray tubesx。
Description
Technical Field
The utility model belongs to the industrial equipment field, concretely relates to kinds of low NOx burner.
Background
The low-medium calorific value gas fuel is widely existed in the production process of industries such as coal production, coal chemical industry, petrochemical industry, steel, metallurgy, textile printing and dyeing and the like, such as coke oven gas, blast furnace gas, converter gas and the like, while the industrial application research on the low-medium calorific value gas fuel is only paid attention in recent years, the gas has low calorific value, but the source is huge in total amount, has important energy-saving and environment-friendly significance for enhancing the cyclic utilization of the gas, is beneficial to improving the energy utilization rate, and further relieves the contradiction between energy supply and demand in China.
With the development of combustion technology, the development of burners using medium and low calorific value gas as fuel has become which is an important subject of energy conservation and emission reduction in our country, however, for many years, research on medium and low calorific value gas fuel burners mainly focuses on the improvement of the performance of the burners, and the attention on the control of nitrogen oxides in combustion flue gas is far from enough.
With the implementation of the latest atmospheric pollutant emission Standard (GB13223-2011), the national multi-site export policy requires NO of the gas boilerxThe emission mass concentration is controlled to be 30mg/m3(Standard, 3.5% O)2) The following.In order to meet the latest environmental protection standard, kinds of burners with reasonable structure, high combustion efficiency and NO need to be developed and designed on the basis of the existing technologyxLow emission gaseous fuel low nitrogen burner.
Disclosure of Invention
To the not enough and defect of above-mentioned prior art, the utility model discloses an aim at discloses kinds of low-nitrogen combustion wares, solves the combustor structure complicacy among the prior art, and combustion efficiency is low, and local combustion temperature is high, NOxHigh discharge concentration.
In order to solve the technical problems, the low-nitrogen combustor comprises kinds of low-nitrogen combustors, and comprises a shell, wherein the shell is formed by coaxially connecting a fuel section and a combustion section, and the outer wall of the fuel section is vertically connected with a fuel gas connecting pipe;
the outer wall of the combustion section is vertically connected with a combustion-supporting air connecting pipe, the combustion section also comprises a fuel gas channel communicated with the fuel section, and the low-nitrogen combustor also comprises an ignition device coaxially sleeved with the shell;
the combustion section also comprises a plurality of -grade fuel gas branch pipelines which are arranged along the radial direction of the fuel gas channel and are communicated, the -grade fuel gas branch pipeline end is communicated with the fuel gas channel, the other end is closed, and a plurality of -grade fuel nozzles are uniformly arranged on each -grade fuel branch pipeline along the two circumferential sides;
the inner side of the combustion section is also connected with a secondary fuel gas annular space channel, a secondary fuel gas branch pipeline is connected between the secondary fuel gas annular space channel and the fuel gas channel, and the secondary fuel gas branch pipeline is connected in the combustion section;
and an annular plate is arranged at the end of the secondary fuel gas annular space channel, which is far away from the secondary fuel gas branch pipeline, and a plurality of secondary fuel spray pipes are uniformly arranged on the annular plate along the circumferential direction.
The utility model discloses still have following technical characteristic:
round spray holes, a second round spray hole and a third round spray hole are uniformly arranged on the end face of the secondary fuel spray pipe along the circumference, included angles between the round spray hole, the second round spray hole and the third round spray hole and the axial direction of the spray pipe are all 15 degrees, the round spray hole inclines outwards along the radial direction of the ring plate, and the second round spray hole and the third round spray hole incline inwards along the radial direction of the ring plate.
The combustion section is formed by communicating a combustion-supporting air cavity, a combustion-supporting air channel and a combustion cavity, and the combustion-supporting air connecting pipe is communicated with the combustion-supporting air cavity.
The combustion-supporting air cavity is also coaxially provided with a combustion-supporting air uniform distributor, the combustion-supporting air uniform distributor is formed by coaxially connecting a diameter-equalizing section and an expanding section, the diameter-equalizing section is in a hollow cylindrical shape, and the expanding section is in a hollow circular truncated cone shape;
the combustion-supporting air uniform distributor is provided with a plurality of uniform grooves along the circumferential direction.
A combustion air swirling device is further arranged in the combustion air channel, the combustion air swirling device is of a two-layer structure and comprises -grade swirling blades and two-grade swirling blades from inside to outside, the flow area ratio of the -grade swirling blades to the two-grade swirling blades is 2-3: 7-8, and included angles between the -grade swirling blades and the axial direction of the two-grade swirling blades are 30 degrees;
the combustion-supporting air cyclone device is sleeved with the second fuel gas channel, and the outer diameter of the combustion-supporting air cyclone device and the inner diameter of the combustion-supporting air channel are -size.
And the combustion-supporting air cavity is also connected with a flue gas recirculation interface.
And a baffle is arranged at the end of the secondary fuel gas annular space channel close to the combustion air uniform distributor.
The ignition device comprises an incandescent lamp and a flame monitoring device which are arranged side by side, and the ignition device penetrates through the fuel gas channel.
The lamp is characterized in that a high-energy ignition gun is arranged in the incandescent lamp, the tail end of the incandescent lamp is of a horn-shaped structure, and a plurality of round holes are circumferentially and uniformly distributed on a horn mouth.
Compared with the prior art, the utility model, profitable technological effect is:
(I) the utility model discloses a hierarchical and flue gas inner loop's of fuel structure, whole combustion air is behind the swirl device whirl, with level fuel nozzle spun air current perpendicular striking, the air current after the intensive mixing is lighted by the pilot burner central pilot burner, in the combustor exit, a large amount of second grade fuel is by the high-speed blowout of second grade fuel nozzle, add the burning, high-speed air current or flame form local negative pressure, at the inside flue gas entrainment backward flow that produces of boiler furnace, form low temperature rich burning zone, the combustion temperature is also less than 1500 ℃ far away this moment to reduce NOx。
(II) the utility model discloses still adopted the structure of flue gas extrinsic cycle, part is discharged fume and is returned to combustion-supporting air cavity through the flue gas recirculation interface, mixes with combustion-supporting air, reduces combustion-supporting air's oxygen concentration to reduce combustion intensity, the flue gas that returns simultaneously can absorb partial heat, reduces combustion temperature, thereby restraines nitrogen oxide's formation.
Drawings
Fig. 1 is a schematic sectional structure diagram of the present invention.
Fig. 2 is a right side view structure diagram of the present invention.
FIG. 3 is a schematic cross-sectional view of an -class fuel gas branch pipe.
FIG. 4 is a schematic illustration of a secondary fuel gas nozzle tip configuration.
FIG. 5 is a schematic view of a combustion air distributor.
FIG. 6 is a schematic view of the structure of the combustion air swirling device.
The meaning of each reference number in the figure is 1-shell, 2-fuel section, 3-combustion section, 4-fuel gas connecting pipe, 5-combustion air connecting pipe, 6-fuel gas channel, 7-ignition device, 8- grade fuel gas branch pipe, 9- grade fuel nozzle, 10-secondary fuel gas annular gap channel, 11-secondary fuel gas branch pipeline, 12-annular plate, 13-secondary fuel spray pipe, 14- round spray hole, 15-second round spray hole, 16-third round spray hole, 17-combustion air cavity, 18-combustion air channel, 19-combustion cavity, 20-combustion air uniform distributor, 21-diameter-equalizing section, 22-diameter expanding section, 23-flow equalizing groove, 24-combustion air swirling device, 25- grade swirling vane, 26-secondary swirling vane, 27-flue gas recirculation interface, 28-baffle, 29-long bright lamp, 30-flame monitoring device, 31-high-energy ignition gun.
The details of the present invention are further illustrated in detail in the following description in conjunction with the figures and examples.
Detailed Description
The following embodiments of the present invention are given, and it should be noted that the present invention is not limited to the following embodiments, and all the equivalent transformations made on the basis of the technical solution of the present application all fall into the protection scope of the present invention.
Example (b):
following the above technical solution, as shown in fig. 1 to 6, the present embodiment provides kinds of low-nitrogen burners, which includes a casing 1, the casing 1 is formed by coaxially connecting a fuel section 2 and a combustion section 3, a fuel gas connection pipe 4 is vertically connected to an outer wall of the fuel section 2, and the fuel gas connection pipe is used for introducing fuel gas.
The outer wall of the combustion section 3 is vertically connected with a combustion-supporting air connecting pipe 5, the combustion section 3 also comprises a fuel gas channel 6 communicated with the fuel section 2, and the low-nitrogen combustor also comprises an ignition device 7 coaxially sleeved with the shell 1; the combustion-supporting air connecting pipe is used for introducing combustion-supporting air, the fuel gas channel is used for conveying fuel gas, and the ignition device is used for ignition.
The combustion section 3 also comprises a plurality of -level fuel gas branch pipelines 8 which are arranged along the radial direction of the fuel gas channel 6 and are communicated, the ends of the -level fuel gas branch pipelines 8 are communicated with the fuel gas channel 6, the other ends of the -level fuel gas branch pipelines are closed, a plurality of -level fuel nozzles 9 are uniformly arranged on each -level fuel branch pipeline 8 along the two circumferential sides, parts of fuel gas enter the -level fuel gas branch pipelines through the fuel gas channel and then are sprayed out through the -level fuel nozzles to participate in combustion.
The inner side of the combustion section 3 is also connected with a secondary fuel gas annular space channel 10, a secondary fuel gas branch pipeline 11 is connected between the secondary fuel gas annular space channel 10 and the fuel gas channel 6, and the secondary fuel gas branch pipeline 11 is connected in the combustion section 3;
the end of the secondary fuel gas annular space channel 10 far away from the secondary fuel gas branch pipeline 11 is provided with an annular plate 12, the annular plate 12 is evenly provided with a plurality of secondary fuel spray pipes 13 along the circumferential direction, and part of fuel gas enters the secondary fuel gas branch pipeline through the fuel gas channel, passes through the secondary fuel gas annular space channel and then is sprayed out from the secondary fuel spray pipes to participate in combustion.
kinds of preferred secondary fuel nozzles 13 in the embodiment are uniformly provided with circular nozzle holes 14, second circular nozzle holes 15 and third circular nozzle holes 16 on the end surface of the secondary fuel nozzle 13 along the circumference, the circular nozzle holes 14, second circular nozzle holes 15 and third circular nozzle holes 16 are all arranged at an angle of 15 degrees with the axial direction of the nozzle, the circular nozzle holes 14 are inclined towards the outer side along the radial direction of the ring plate 12, and the second circular nozzle holes 15 and third circular nozzle holes 16 are inclined towards the inner side along the radial direction of the ring plate 12.
When the fuel gas is sprayed out from the circular nozzle at a high speed, the fuel gas can entrain surrounding smoke, the combustion temperature can be reduced, and the formation of a local high-temperature area in the combustion process is avoided.
The circular spray holes incline outwards along the radial direction of the ring plate, which plays the role of dispersed combustion and avoids forming local violent high-temperature combustion area.
The second circular spray holes and the third circular spray holes are inclined inwards along the radial direction of the ring plate, so that secondary fuel gas is directly sprayed into the central combustion area, plays a role in stable combustion, high-speed airflow entrainment surrounding smoke is added for combustion, the central temperature of combustion can be reduced, and a local high-temperature area is prevented from being formed.
Preferably, types of the present embodiment are provided, the combustion section 3 is formed by communicating a combustion air cavity 17, a combustion air channel 18 and a combustion cavity 19, and the combustion air connecting pipe 5 is communicated with the combustion air cavity 17.
Preferably combustion-supporting air distributors 20 are coaxially arranged in the combustion-supporting air cavity 15, each combustion-supporting air distributor 20 is formed by coaxially connecting a diameter-equalizing section 21 and an expanding section 22, each diameter-equalizing section 21 is in a hollow cylindrical shape, and each expanding section 22 is in a hollow circular truncated cone shape;
the combustion air uniform distributor 20 is provided with a plurality of flow equalizing grooves 23 along the circumferential direction.
The combustion-supporting air distributor makes combustion-supporting air uniformly distributed in the circumferential direction from the combustion-supporting air cavity into the combustion-supporting air channel, prevents the combustion-supporting air from directly entering the combustion-supporting air channel from the inlet side, and prevents the combustion-supporting air from being seriously unevenly distributed, thereby affecting the mixing with grade fuel gas, and in addition, makes the recirculation flue gas returned to the combustion-supporting air cavity uniformly distributed in the circumferential direction into the combustion-supporting air channel, and makes the recirculation flue gas and the combustion-supporting air fully mixed, thereby avoiding the recirculation flue gas and the combustion-supporting air from directly impacting to cause uneven air flow distribution.
Preferably combustion-supporting air swirling devices 24 are further arranged in the combustion-supporting air channel 18, each combustion-supporting air swirling device 24 is of a two-layer structure and comprises -stage swirling vanes 25 and two-stage swirling vanes 26 from inside to outside, the flow area ratio of the -stage swirling vanes 25 to the two-stage swirling vanes 26 is 2-3: 7-8, and included angles between the -stage swirling vanes 25 and the two-stage swirling vanes 26 and the axial direction are all 30 degrees;
the main action of the combustion-supporting air cyclone device is that the combustion-supporting air generates stronger rotation after passing through the cyclone blades by using the cyclone action of the cyclone blades so as to strengthen the mixing of the combustion-supporting air and the fuel gas, and that the combustion-supporting air is divided into -grade combustion-supporting air and second-grade combustion-supporting air according to the area ratio of the two-stage cyclone blades so that the combustion-supporting air and -grade fuel gas are mixed and combusted in different forms and time.
The combustion-supporting air swirling device 24 is sleeved with the second fuel gas channel 10, and the outer diameter of the combustion-supporting air swirling device 24 and the inner diameter of the combustion-supporting air channel 18 are .
Preferably of the present embodiment, the flue gas recirculation port 27 is further connected to the combustion air chamber 17.
the smoke returns to the combustion air cavity through the smoke recirculation interface, and mixes with the combustion air, reduces the oxygen concentration of the combustion air, thus reduces the combustion intensity, and the returned smoke can absorb partial heat, reduces the combustion temperature, thus inhibits the generation of nitrogen oxide.
Preferably in this embodiment, the secondary fuel gas annulus 10 is provided with baffles 28 near the end of the combustion air distributor 20 to separate it from the combustion air chamber.
Preferably in the present embodiment, the ignition device 7 comprises the pilot light 29 and the flame monitor 30 arranged side by side, and the ignition device 7 penetrates the fuel gas passage 6.
Preferably, kinds of the present embodiment, the high-energy ignition gun 31 is arranged in the pilot burner 29, the end of the pilot burner 29 is a trumpet-shaped structure, and a plurality of round holes are evenly distributed on the trumpet-shaped opening in the circumferential direction.
The flame monitoring device 30 is used for monitoring the flame of the pilot burner 29 in the burner in real time and performing safety interlocking control with the whole burner system. When abnormal working conditions such as failure of ignition of the burner, sudden fire extinguishment of a long and bright lamp in the hearth and the like occur, the signal lamp of the flame detection device 30 is extinguished and fed back to the central control system. The system instantly cuts off the fuel gas supply through interlocking control, and the system safety is ensured.
Wherein, the fuel gas adopts coke oven gas.
Wherein the residual gas coefficient of the combustion air is 1.3-1.4.
Wherein the proportion of the grade fuel to the secondary fuel is 30-40% and 60-70%.
Wherein the amount of the recycled flue gas is 15-25% of the total amount of the flue gas.
The specific working process of this embodiment is as follows:
partial smoke is returned to the combustion air cavity through a Flue Gas Recirculation (FGR) interface to be mixed with the combustion air, so as to reduce the oxygen concentration of the combustion air, thereby reducing the combustion intensity, and meanwhile, the returned flue gas can absorb partial heat, reduce the combustion temperature, thereby inhibiting the generation of nitrogen oxides.
After all the combustion air is swirled by the combustion air swirling device, the combustion air is vertically collided with the fuel airflow sprayed out from the -grade fuel nozzle, and the fully mixed airflow is ignited by the pilot burner at the center of the burner. -grade fuel and all the combustion air form an oxygen-rich lean-burn area at the center of the burner, although the excess coefficient of the combustion air is very large, the fuel quantity is very small, so the combustion temperature is very high at the positionWell below 1500 deg.c so that NO significant amounts of NO are formedx. At the outlet of the burner, a large amount of secondary fuel is sprayed out from a secondary fuel nozzle at a high speed to be added for combustion, high-speed airflow forms local negative pressure, smoke entrainment backflow is generated inside a boiler hearth to form a low-temperature rich combustion area, the combustion temperature is far lower than 1500 ℃, and therefore a large amount of NO can not be formedxThereby ensuring the burner outlet NOxThe mass concentration of the discharged matter is less than 30mg/m3And meets the latest environmental protection requirement.
Claims (9)
- The low-nitrogen combustor comprises a shell (1), wherein the shell (1) is formed by coaxially connecting a fuel section (2) and a combustion section (3), and the outer wall of the fuel section (2) is vertically connected with a fuel gas connecting pipe (4);the outer wall of the combustion section (3) is vertically connected with a combustion-supporting air connecting pipe (5), the combustion section (3) further comprises a fuel gas channel (6) communicated with the fuel section (2), and the low-nitrogen combustor further comprises an ignition device (7) coaxially sleeved with the shell (1);the fuel gas burner is characterized in that the combustion section (3) further comprises a plurality of -level fuel gas branch pipelines (8) which are radially arranged along the fuel gas channel (6) and communicated with each other, the -level fuel gas branch pipeline (8) end is communicated with the fuel gas channel (6), the other end is closed, and a plurality of -level fuel nozzles (9) are uniformly arranged on each -level fuel gas branch pipeline (8) along the two circumferential sides;the inner side of the combustion section (3) is also connected with a secondary fuel gas annular space channel (10), a secondary fuel gas branch pipeline (11) is connected between the secondary fuel gas annular space channel (10) and the fuel gas channel (6), and the secondary fuel gas branch pipeline (11) is connected in the combustion section (3);the end of secondary fuel gas annular space channel (10) far away from secondary fuel gas branch pipeline (11) is provided with annular plate (12), annular plate (12) evenly set up a plurality of secondary fuel spray pipes (13) along circumference.
- 2. The low-nitrogen combustor as claimed in claim 1, wherein circular nozzle holes (14), 15 and 16 are uniformly arranged on the end face of the secondary fuel nozzle (13) along the circumference, the circular nozzle holes (14), 15 and 16 are all at an angle of 15 degrees with the axial direction of the nozzle, the circular nozzle holes (14) are inclined along the radial outer side of the annular plate (12), and the second circular nozzle holes (15) and the third circular nozzle holes (16) are inclined along the radial inner side of the annular plate (12).
- 3. The low-nitrogen burner according to claim 1, wherein the combustion section (3) is formed by communicating a combustion air cavity (17), a combustion air channel (18) and a combustion cavity (19), and the combustion air connecting pipe (5) is communicated with the combustion air cavity (17).
- 4. The low-nitrogen burner according to claim 3, characterized in that a combustion air uniform distributor (20) is coaxially arranged in the combustion air cavity (17), the combustion air uniform distributor (20) is formed by coaxially connecting a diameter-equalizing section (21) and a diameter-expanding section (22), the diameter-equalizing section (21) is hollow cylindrical, and the diameter-expanding section (22) is hollow truncated cone-shaped;the combustion-supporting air uniform distributor (20) is provided with a plurality of uniform flow grooves (23) along the circumferential direction.
- 5. The low-nitrogen combustor according to claim 3, wherein a combustion air swirling device (24) is further arranged in the combustion air channel (18), the combustion air swirling device (24) is of a two-layer structure and comprises -stage swirling vanes (25) and two-stage swirling vanes (26) from inside to outside, the flow area ratio of the -stage swirling vanes (25) to the two-stage swirling vanes (26) is 2-3: 7-8, and included angles between the -stage swirling vanes (25) and the two-stage swirling vanes (26) and the axial direction are 30 degrees;the combustion-supporting air swirling device (24) is sleeved with the secondary fuel gas annular gap channel (10), and the outer diameter of the combustion-supporting air swirling device (24) and the inner diameter of the combustion-supporting air channel (18) are -size.
- 6. A low-nitrogen burner as claimed in claim 3, characterised in that the combustion air chamber (17) is also connected to a flue gas recirculation connection (27).
- 7. The low-nitrogen burner of claim 1, wherein the secondary fuel gas annulus (10) is provided with a baffle (28) near the end of the combustion air distributor (20).
- 8. A low-nitrogen burner as claimed in claim 1, wherein the ignition means (7) comprises a pilot burner (29) and a flame monitoring device (30) arranged side by side, the ignition means (7) extending through the fuel gas channel (6).
- 9. The low-nitrogen burner as claimed in claim 8, wherein a high-energy ignition gun (31) is arranged in the pilot burner (29), the tail end of the pilot burner (29) is of a horn-shaped structure, and a plurality of round holes are uniformly distributed on the bell mouth in the circumferential direction.
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| CN201920447790.6U CN210004388U (en) | 2019-04-03 | 2019-04-03 | kinds of low-nitrogen burner |
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| CN201920447790.6U CN210004388U (en) | 2019-04-03 | 2019-04-03 | kinds of low-nitrogen burner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964096A (en) * | 2020-08-21 | 2020-11-20 | 鞍山市科翔仪器仪表有限公司 | Multi-burner sintering cup igniter |
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2019
- 2019-04-03 CN CN201920447790.6U patent/CN210004388U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964096A (en) * | 2020-08-21 | 2020-11-20 | 鞍山市科翔仪器仪表有限公司 | Multi-burner sintering cup igniter |
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